Carbon dioxide compressor and refrigeration system thereof

Abstract

The invention provides a carbon dioxide compressor and a refrigeration system thereof. The carbon dioxide compressor comprises a shell, a motor, a cylinder assembly and an exhaust liquid distributor;the cylinder assembly comprises a first cylinder for performing two-stage compression and a second cylinder for performing first-stage compression; the shell is provided with an upper cover exhaust hole; the first exhaust hole of the first cylinder communicates with a cavity of the shell; gas enters the cavity after being discharged from the first exhaust hole and then is exhausted out of the compressor through the upper cover exhaust hole; and a second exhaust hole of the second cylinder is connected with an inlet of the exhaust liquid distributor. By adopting the carbon dioxide compressor provided by the invention, pressure of the compressor and pressure of the refrigeration system are effectively lowered, an exhaust temperature of the compressor is lowered, and the working efficiency ofthe compressor is improved; and by defining a volume ratio of the first cylinder to the second cylinder and a ratio relationship between the dual-cylinder volume and an exhaust area, an air supplementing structure required for an existing two-stage compressor is removed, airflow disorder caused by the air supplementing structure is avoided, and the running stability of the compressor is improved.

Description

technical field [0001] The invention relates to a refrigeration device, in particular to a carbon dioxide compressor and a refrigeration system thereof. Background technique [0002] Chlorine and bromine atoms in halogenated hydrocarbons can react violently with ozone, destroying the ozone layer in the atmosphere, and even forming an ozone hole. Most of the chlorine and bromine in the atmosphere come from Freon discharged from the refrigeration industry. Therefore, it is an urgent task for the refrigeration industry to replace Freon with other environmentally friendly working fluids. Carbon dioxide has received extensive attention in the refrigeration industry for its excellent environmental performance and thermophysical properties. [0003] Existing carbon dioxide compressors have a high-pressure ratio structure. Under the condition of a large compression ratio, using a single-stage refrigeration cycle to obtain a lower evaporation temperature will produce many harmful fa...

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Problems solved by technology

[0004] In view of the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a carbon dioxide compressor, which effectively solves the problem of performance degradation of the refrigeration system of the existing carbon dioxide compressor under a large compression ratio

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